Air-admission wall for locomotive fire-boxes.



A. H. WILLETT.

AIR ADMISSION WALL FOR LOCOMOTIVE FIRE BOXES. APPLICATION FILED FEB. 1 1, 191s.

lfiggmfig? Patented June 12, 191?.

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iMEt-AIDMEBSIQN WALL F0111 ILQCDMOTIVE FIRE-BGXE$.

Imam Specification of Letters Patent.

Application filed February 1. 1916. Serial No. 27sec.

: type provision is made for the admission of air through the wall and into the firebox space of the firebox. In most instances the air channels extend from the bottom to cop ing bricks of the wall and communicate with the fire chamber through lateral discharge openings in or beneath the coping bricks. The outer surfaces of the coping bricks are exposed to the intense heat, of the firebox gases. which sweep over the wall. In contrast, the under-sides of the coping bricks are constantly subjected to the chilling effect of the incoming air which is of relatively low temperature.

it find that these differences in the tear perature are the cause of the rapid cracl inn and breaking down of the coping bricks, and the object of my invention is to overcome the ditficulty and make the coping bricks more durable; A further object is to interlock the coping bricks with and upon the wall. I accomplish this object in a very simple way and at slight expense, towit, by means of deflecting devices or guards by which the rapidly moving streams of relatively cold air in the admission ducts of the wall are prevent d from impinging upon the under-sides oi the bricks which contain air outlet openings. There are several ducts in each wall and hence I provide several deflectors, one for each duct; These deflectors are preferably made of cast metal and. they are kept cool by the air flowing in the wall ducts. As hereinafl ter explained, the metal deflectors or guards are made to serve interlocking devices for the coping bricks.

ll ly invention will be readily understood on reference to the drawings which accompany and form part ct this specification, and

in Winch l have ilnmt ated my invention in a preferred form, which, serv NEW JERSEY, ASIGNUB T0 AMERICAN ill. 12"., A COBPORATIQN 0 DELAJNAitE.

Patented some t2, iota.

ing as an example, will enable those skilled in the art to adapt the invention to cross W and coping bricks 0t various the'drawings Figure l taining my invention ig.

alls, air ducts designs. In

is a vertical longitudinal section of a. locomotive fireb0X'eon-= 2 is a plural section, one-half thereof being a section on the line XX of Fig. 1 and ing a section on the the other beline Y i ;-Fig. 3 is an enlarged sectional view of the coping brick and interlocking guard shown in Fig.

1; Fig. {l is a sectional view on the line V--V of Fig. 3;l 1g.

on the line W-l straight SHlG'VlGW oi the or deflector ;-and Fig.

5 is a sectional View of Fig. 3;-Fig. 6 is a interlocking guard 7 shows the adaptation of my invention to a Gaines Wall and inclined arch.

One of the most diilieult positions in which to maintain the coping bricks of a cross wall is depicted in Fig. 1. The cross wall, A, 18

inclined rearwardly and the te vibration of the locomotive is t coping bricks, B. My invent ndency of the 0 dislodge the ion is admirably ada )ted for use in such cases for it serves to interlock or fix the upon the top of the co )in bricks wall. In the example shown. the wall contains tubular inetal wall stays, C, of now wcll-known design and function. These stays eatendto the top of the wall proper, but terminate sherbet the bottoms of the co )in bricks B. h 7

inc brick contains ityfl which opens through the wall. Preferably, not formed in made by. the COIIlPlfiIDQDtHIY c the abutting ends of two coping bricks,

best shown in Fig. cavities, B, is notessential.

Each copa lateral opening 01' cavie rear side of a complete cavity is a single coping brick, but 1s avities, B, in B, as

The exact form of the They may have various forms. B'iitwhatever the form of the cavity, I-preit'erably make two vertical recesses, F in. plained hereinafter.

ceording to usual practice rushes up through-a tubular it to include 13, B, best shown in t, and the purpose of which will be exthe air which i stay, C 1mpingcs against theinterior or underside of the coping brick, and

chilling of the brick soon the metal deflectors or guards, the tops of the air ducts and W ties of the coping bricks. line as explained, the causes its destruction. 1 overcome this chfiiculty by'ineans of 2, arranged at ithin the cavihtguard has a shank, 3, on all sides.

on the top brick of the wall bodya. An opening, 6, is provid d at one side of t e casting through which the air which rises through the shank, 3, passes into the dischargbppening or cavity, B. I prefer that the defiec tor, shall be somewhat smaller than the cavity, B, so that the metal is not in con- .with the refractory brick. An insulatnmg material may be used, but I find the air space B" the best for the purpose. I

On each side of the part, 4, is a lug or ear, These lugs are formed to enter the rooves or recesses, 13 of the coping bricks. has the coping bricks are efi'ectively interlocked with one another and also with the body of the wall through the medium of the lugs, 7, and the shank, 3.

it will now be clear that the overhanging deflectors, 4, guard and protect the coping bricks from the air which enters through the ducts, C, and by thus protecting the coping bricks from the chilling effect of the air, the

described disruptive temperature differences are avoided.

As indicated in Fig. "7, I may employ the same or similar interlockin guards or de 3 ilcctors in the top or coping bricks, D, of a.

combined Gaines cross-wall and arch. In such cases it is not so necessary that the metal parts shall serve as interlocking devices, but in other respects they are fully as desirable as in the case of the coping bricks of a simple vertical or inclined cross wall.

Having thus described my invention, I claim as ne and desire to secure by Letters Patent v 1; A firebox cross wall and itsrefractory coping brick. together containing an air duct and a lateral discharge opening, in coinbination with a metal deflector smaller than, and arranged in, and spaced from. the walls of said opening and guarding said coping brick, substantialljas described.

2. A firebox cross wall and its refractory coping brick,'together containing an air duct and a lateral discharge opening, in combination with a metal deflector arranged in said opening and guarding said coping brick, and said deflector being formed to interlock said coping brick and wall, substantially as described.

3. A firebox wall body containing an air duct, in combination with a. coping brick containing a cavity that forms a lateral discharge opening for said duct, a metal deflector positioned in said cavity and smaller than thesaine but interlocked with said coping brick and shank in said duct, and whereby the coping brick is interlocked with said wall body.

In testimony whereof, I have hereunto set my hand this 1st day of February, 1916.

ALFRED H. WLiLLEQlT'.

said deflector having a tubular F 

